JPH06280961A - Continuously variable transmission device with taper roller bearing - Google Patents

Abstract

PURPOSE:To secure excellent shift operation in a compact structure, wherein the frictional resistance or noise is lesser and good manufacturability and economy are ensured. CONSTITUTION:An inner ring 1 is fixed to an input shaft 6, and to the output shaft 7 a follower outer ring 2 is fixed concentrically on the same radius line as the inner ring, and a conical part 27 to form at the tip a ridge 26 which is parallel with the axis of the input shaft 6, is formed between the inner ring 1 and the follower outer ring 2, wherein a number of taper rollers 3 are interposed which are retained by a retainer 8 rotatable relative to the input shaft 6 and roll while circumscribing with the inner ring 1 and inscribing with the outer ring 2. A rotation-restrained outer ring 4 in contact with the ridges 26 of the conical parts 27 of the taper rollers 3 while circumscribing is installed on the case body 9 in such a way as movable only in the axial direction to the left and right so that a planetary differential decelerating mechanism composed of the inner ring 1, taper rollers 3, rotation-restrained outer ring 4, and follower outer ring 2, and therewith the rotation of the input shaft 6 is decelerated and transmitted to the output shaft 7 steplessly within the set range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission having a tapered roller structure for use in various industrial machines, machine tools, office equipment, transportation vehicles and the like.

[0002]

2. Description of the Related Art As a conventional continuously variable transmission, large and small cone plates are provided to move the small cone plates in the axial direction to change their contact diameters, and the contact diameter is changed by changing the angle of a spherical rotor. There are various types, such as a displacement of the position of the flat disk and the conical rotor, and a type of changing the effective friction diameter of the V-belt type, but there is no type of bearing bearing structure.

[0003]

However, the above-mentioned various conventional continuously variable transmissions do not have a large number of rotors, but have a complicated shape and include a spring mechanism, etc. In addition, there are problems to be solved in that friction resistance, noise, vibration, transmission efficiency, and miniaturization are difficult.

An object of the present invention is to solve the above-mentioned problems, and by making use of a bearing structure in which a large number of rotors can be set, the advantage is taken advantage of, the strength is excellent, and a large number of taper rollers can be set. Provide a continuously variable transmission with a tapered roller bearing structure that has a durable structure, stable precision, low frictional resistance and noise, compact size, and excellent manufacturability and economical efficiency due to the bearing structure. Especially.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and includes an input shaft 6 and an output shaft 7.
Are continuously supported on the coaxial line by bearings 19a and 19b, and an input side flange 10 and an output side flange 11 and an input side bearing cover 12 and an output side bearing retainer cover 13 fixed to the case body 9 via the respective flanges. Is supported by an input bearing 17 and an output bearing 18, which are fixed to the input shaft 6 by fixing the inner ring 1 and the output shaft 7 by fixing the driven outer ring 2 as a concentric circle on the same radial line as the inner ring 1. A conical portion 27 having a ridge line 26 formed at the tip between the inner ring 1 and the driven outer ring 2 and parallel to the axis of the input shaft 6.
And a plurality of taper rollers 3 which are held by a retainer 8 which is rotatable with respect to the input shaft 6 and which is circumscribed on the inner ring 1 and inscribed on the driven outer ring 2 so as to intervene.
The case body 9 includes a conical portion 27 of the taper roller 3.
A fixed rotation outer ring 4 that comes into contact with the ridge line 26 and is circumscribed is equipped so as to be able to move left and right only in the axial direction, and a planetary differential reduction mechanism including the inner ring 1, the taper roller 3, the fixed rotation outer ring 4 and the driven outer ring 2 The invention is based on a continuously variable transmission having a tapered roller bearing structure, characterized in that the rotation of the input shaft 6 is continuously transmitted to the output shaft 7 within a set range.

[0006]

With the above-described structure, when the input shaft 6 is driven to rotate, the inner ring 1 rotates in the sun, and the respective taper rollers 3 rotate about their axes while revolving with the cage 8. However, each rotation of the taper portion of the tapered roller 3 on the driven outer ring 2 side and the conical portion 27 in contact with the rotation fixed outer ring 4
The rotation speed is different from each rotation of the part.

The rotation speed of the conical portion 27 of the taper roller 3 which is in contact with the fixed rotation outer ring 4 is changed by the movement of the fixed rotation outer ring 4. However, since the taper roller 3 is integrated with the conical portion 26 and the rotation fixed outer ring 4 is fixed, the rotatable driven outer ring 2 is allowed to escape by the rotation difference, and the output shaft 7 is rotated by the differential amount. To do.

Therefore, the rotation of the taper roller 3 is always determined by the relationship with the rotation fixed outer ring 4, and the rotation number is determined by the contact diameter of the conical portion 27 at the position where the rotation fixed outer ring 4 is set to move, while the driven outer ring 2 part is Taper roller 3
Since the number of rotations of the driven outer ring 2 is constant,
Will rotate and have a continuously variable speed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a continuously variable transmission having a tapered roller bearing structure according to the present invention will be described. FIG. 1 is a sectional structural view, and the input shaft 6 and the output shaft 7 are thrust bearings 19a and It is rotatably connected on the same axis using a radial bearing 19b, and the input shaft 6 has a key 25.
Is provided with an inner ring 1 fixed in the rotational direction, and the output shaft 7 is provided with a driven outer ring 2 fixed with a key 25 on the inner surface of a cup-shaped portion 28 integrated with the output shaft 7. Between the ridge line 2 parallel to the axis of the input shaft 6
A conical portion 27 forming 6 is formed and is evenly arranged to be held by a retainer 8 rotatably supported by a retainer bearing 22 on the input shaft 6 so as to be circumscribed on the inner ring 1 and inscribed on the driven outer ring. In addition, a large number of taper rollers 3 are interposed.

The taper roller 3 is attached to the case body 9.
The moving arm 14 having the fixed rotation outer ring 4 fixed to the ridge line 26 of the conical portion 27 by point contact is equipped with a horizontal movement control screw 16 and a guide pin 15 so that the movement arm 14 can move right and left only in the axial direction. The input side opening of the case body 9 is closed by the input side flange 10, and the input side bearing pressing cover 12 having a plurality of bearing preloading bolt holes 23 is fixed to the input side flange 10.
The input bearing 17 mounted on the input shaft 6 is made liquid-tight by supporting the input side flange 10 and the input side bearing pressing cover 12 and mounting an input shaft oil seal 20 between the input shaft 6 and the input shaft 6. .

The output side opening of the case body 9 is closed by the output side flange 11, and the output side flange 11 is provided with a plurality of bearing preload pressing bolt holes 24. Fixed, output shaft 7
The output bearing 18 mounted on the output side flange 11
And the output side bearing retainer cover 13 and the output shaft oil seal 21 is mounted between the output shaft 7 and the output shaft 7 so as to be liquid-tight.

[0012]

According to the continuously variable transmission having the tapered roller bearing structure according to the present invention described above, the planetary differential mechanism has a bearing structure that utilizes the rolling of the tapered roller, so that the transmission efficiency is extremely good. It is smooth, has less noise and vibration, and it is robust and stable because it is received by many taper rollers, it has less heat generation and has excellent durability. Also, since preload compensation is easy, backlash compensation can be done easily, With respect to the rotation speed of the taper roller that contacts the driven outer ring, the rotation speed difference at the contact part of the conical part formed integrally with the taper roller with the rotating fixed outer ring can be displaced, ensuring an efficient continuously variable gear shift. it can.

Further, since the planetary differential mechanism also serves as a bearing, a robust and small continuously variable transmission can be obtained, and the input / output shaft is concentric and the cross section perpendicular to the shaft has a circular structure, so that the balance is balanced. The accuracy is good, the structure is simple, the manufacturability is good, and it can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a continuously variable transmission having a tapered roller bearing structure according to an embodiment.

[Explanation of symbols]

1 inner ring 2 driven outer ring 3 taper roller 4 rotation fixed outer ring 6 input shaft 7 output shaft 8 retainer 9 case body 10 input side flange 11 output side flange 12 input side bearing retainer cover 13 output side bearing retainer cover 14 moving arm 15 guide Pin 16 Left-right movement control screw 17 Input bearing 18 Output bearing 19a Thrust bearing 19b Radial bearing 20 Input shaft oil seal 21 Output shaft oil seal 22 Cage bearing 23 Bearing preloading bolt hole 24 Bearing preloading bolt hole 25 Key 26 Ridge 27 Cone 28 Cup-shaped part

Claims (1)

[Claims] 1. The input shaft 6 and the output shaft 7 are supported continuously by bearings 19a and 19b on a coaxial line, and an input side flange 10 and an output side flange 11 are attached to a case body 9.
Is provided and the input bearing 17 and the output bearing 18 are provided on the respective flanges.
Is supported by the input side bearing cover 12 and the output side bearing retainer cover 13 in the thrust direction, the inner ring 1 is fixed to the input shaft 6, and the output shaft 7 has the same radius as the inner ring 1. The driven outer ring 2 is fixed on the line as a concentric circle, and a conical portion 27 is formed between the inner ring 1 and the driven outer ring 2 to form a conical ridge line 26 parallel to the axis of the input shaft 6 at the tip end thereof. A plurality of taper rollers 3 which are held by a retainer 8 which is rotatable with respect to 6 and circulates in contact with the inner ring 1 and the driven outer ring 2 are interposed, and the case body 9 is provided with A rotary fixed outer ring 4 that comes into contact with the ridge line 26 of the conical portion 27 of the taper roller 3 and circumscribes is equipped so as to be horizontally movable only in the axial direction. Planetary differential reduction by 2 and Constitute a mechanism, the continuously variable transmission of the tapered roller bearing structure, characterized in that so as to change transmission to the output shaft 7 in a stepless range set the rotation of the input shaft 6.